Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9cc1513f9db1ca…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 18:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1edfb71bd44b84783927268a3545a9f6 SHA-1: f9f66782b0760a5c04de0a5f94f6a42c77befd6e SHA-256: 0f9cc1513f9db1caab7b96c8f200070d009597218bac794752c91f8fa4313971
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain sequences that could be interpreted as commands, further supporting a malicious purpose. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=happiest+season+legendado+online PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8094b6d62---foxumevuxogaxizinilolo.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/pedakavutal.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qep5f6u4jimo7hq5cj5ibjhuis/juzenewiserevote.pdfIn PDF document text
    • http://signauction.net/userfiles/file/42342404265.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/15711420448.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kitirizaxababibusibonevud.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4126947e58ea515ae20d4a9de008d485/wusigegupugafebox.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/37415794472.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/14284574698.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/pakuvujaziputarel.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/lezij.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee9380c1f---88710762122.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109081317363337.pdfIn macro / runtime command snippet
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e02a47d807b9f6c93bf6b2a59a88dcc5/pirazukonagizuvawisotuk.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/76610747806.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/6894562344.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/gugoduw.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134714cbc5d3---15811761017.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/77369621066.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/89915864140.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/xefaperopilumamasudatige.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f625065f73---83026137476.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/sevedadesisotinuwurugokir.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/wotadovoxuxuvifevodaj.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/87254087778.pdfIn PDF document text
    • https://www.hungarianassociatIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C5 10460 bytes
SHA-256: 82e286a8f9574562a82fcb0c5ec9a43fe023e3044015e97a55ad86a26c0ed458
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 17756 bytes
SHA-256: 8b1c9d74f557fa2be1ae5a87bf65f76900470c9c4d45d91a5e5ee7986124aa5c

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